Measurements of the branching fractions of $\chi_{cJ}\to 2K^+ 2K^- \omega$ and $\phi K^+ K^- \omega$ decays

TL;DR

This paper reports the first measurement of branching fractions for specific $ ext{chi}_{cJ}$ decays involving multiple kaons and omega or phi mesons, using a large $ ext{psi}(3686)$ dataset at BESIII.

Contribution

It provides the first measurements of these decay modes' branching fractions, expanding understanding of charmonium decay processes.

Findings

First observation of $ ext{chi}_{cJ} o 2K^+ 2K^- \omega$ decays

First observation of $ ext{chi}_{cJ} o ext{phi} K^+ K^- \omega$ decays

Branching fractions measured with significance over 10$\sigma$

Abstract

Using a data sample of $(2712.4 \pm 14.3) \times 10^{6}$ $\psi(3686)$ events collected with the BESIII detector operating at the BEPCII collider, we report the first observation of the decays $\chi_{cJ}\to 2K^+ 2K^- \omega$ and $\chi_{cJ}\to \phi K^{+}K^{-} \omega$ ($J = 0,1,2$) via the radiative transitions $\psi(3686) \to \gamma \chi_{cJ}$. The branching fractions of these decays are measured for the first time, and the statistical significance for each signal exceeds $10\sigma$.